| 基于可调谐FP滤波器的光纤光栅解调系统 |
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| 引用本文： | 李营,张书练.基于可调谐FP滤波器的光纤光栅解调系统[J].激光技术,2005,29(3):237-240. |
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| 作者姓名： | 李营 张书练 |
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| 作者单位： | 1.清华大学, 精密仪器测试技术与仪器国家重点实验室, 北京, 100084 |
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| 摘 要： | 为了进一步提高光纤光栅解调系统的性能,提出和研究了一种新颖的基于可调谐F-P(Fabry-Perot)滤波器的光纤光栅解调技术,并以此为基础构建了探测系统。系统使用一个固定波长的参考光纤光栅作为波长参考元件,通过对传感光纤光栅与参考光纤光栅的波长测量与差值运算,消除了可调谐FP滤波器腔长漂移对测量精度的影响。给出压电陶瓷电压对应的伸长量,有效地减小了压电陶瓷非线性对测量的影响,提高了光纤光栅波长的测量精度。在测量范围内,最大非线性偏差为0.5%。
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| 关 键 词： | 光纤光栅 非线性 二次函数 可调谐FP滤波器 |
| 文章编号： | 1001-3806(2005)03-0237-04 |
| 收稿时间： | 2004/5/8 |
| 修稿时间： | 2004年5月8日 |
A novel fiber Bragg grating sensor interrogation system utilizing a tunable Fabry-Perot filter |
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| LI Ying,ZHANG Shu-lian.A novel fiber Bragg grating sensor interrogation system utilizing a tunable Fabry-Perot filter[J].Laser Technology,2005,29(3):237-240. |
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| Authors: | LI Ying ZHANG Shu-lian |
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| Abstract: | To improve the performance of FBG interrogation system,a novel fiber Bragg grating sensor interrogation system based on a tunable fiber Fabry-Perot (FFP) filter was demonstrated.Firstly,a reference fiber Bragg grating (FBG) was used as a wavelength reference element.By measuring the wavelength difference between reference FBG and sensor FBG,the drift of tunable FFP filter's cavity length was compensated.Secondly,a quadratic fit function wa s made with software based on experiment results.This function showed a good fit to the relationship between the displacement of PZT and control voltage.It was used to calculate the wavelength of the sensing FBG.In experiment,a strain of 0~1800 με was applied to the sensing FBG and the maximum nonlinearity deviat ion of measured wavelength was 0.5%.Experiment results show that the measured er ror caused by the drift of FFP filter's cavity length and PZT's nonlinearity is greatly reduced and a higher accuracy is obtained. |
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| Keywords: | fiber Bragg grating nonlinearity quadratic fi t function tunable fiber Fabry-Perot filter |
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